Maintenance & Technical > KX500 Original
Jetting!!! Again and again and again!
KXcam22:
Gowen,
I asked a couple of the ice racers I work with. They both (CR & YZ250's) run H1-R at 50:1, winter & summer. I am interested to know what Doordie runs. Cam.
KXcam22:
Going to try a 55 pilot this weekend. Have been running a 58 for years but want to try it a tad leaner to see how it responds. According to the jetting chart I am right on the verge of needing it. Cam.
gowen:
Cam, I've done a few rides now using C12 mixed with Pump 93 mixed at 50:1 using H1R, then Benol @ 50:1 as it was the only oil I had then. I took it out to a local park and ran it hard, soft, all around and it performed well, but smoke was still pretty bad. I started out at 42 pilot, 162 main, 2nd notch. Moved down to a 160 main and it performed great and the smoke left, I've put about 10 hours on the 50:1 and no problems to speak of.
I did take it again afterwords and it was raining, humid and around 80 degrees. It ran pretty rich, and I did fool around with the air screw, which did not help the performance which I found was in the WOT range. So, I needed to move down to a 158 then, but a 160 seems to be the ticket for a nice day. Maybe a 158 would be sufficient. But who knows.
Thanks
KXcam22:
Gowen,
I'm still suprised that your 520 big bore requires leaner jetting that stock. I always assumed that increasing the bore would increase the fuel demand, hence richer jetting. You and Kawadude are both leaner. What do I know. My bike runs great but I have been slowly leaning it out a bit more. I went 168 to 165 a few months ago and noticed a nice improvement. Will try the 55 tomorrow. How are you healing? Cam.
gowen:
The only thing short of a 520 kit Kawdude and myself did, is I moved for topend power and he got the overall power. Which I've been told that is why I'm way down on the low numbers as for idleing.
As far as healing goes, I've been able to ride, I've been told not to ride hard and to take it easy for the next 6 months............... Right, like that is going to happen. :-)
Thanks for asking, I'll keep updating as I fish around the carb.
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